Dreame L40 Ultra Gen 2 vs Roborock Saros 20 Sonic

The Dreame L40 Ultra Gen 2 edges it on the rounded package. It matches the same self-emptying, self-washing dock and adds a longer rated runtime, a three year warranty and slightly larger tank and bins. The Roborock Saros 20 Sonic is the more powerful cleaner and the better connected one.

Suction and connectivity. The Roborock Saros 20 Sonic is rated at 36,000 Pa and adds 5 GHz Wi-Fi, Bluetooth and native Matter, Apple Home and SmartThings support, while the Dreame L40 Ultra Gen 2 is 2.4 GHz only at 25,000 Pa and reaches those platforms later through an update.

Yes, both docks empty the bin, wash the mop and dry it with hot air, and both lift the mop over carpet. The difference is detergent: the Roborock Saros 20 Sonic dispenses it on its own, while the Dreame L40 Ultra Gen 2 needs the separate dispenser accessory.

The Dreame L40 Ultra Gen 2 is rated for about 231 minutes and the Roborock Saros 20 Sonic for about 190 minutes. Both return to the dock on their own and recharge before resuming.

Buyers who want a long runtime, a three year warranty and larger tank and bins, and who keep their smart home on Alexa or Google Home or can wait for Matter through a pending update.

Homes that need the highest suction, dual-band Wi-Fi with Bluetooth, and Apple Home, SmartThings, Home Assistant or Matter working today without waiting for an over-the-air update.